RECON: TNO occultation with 98WW31

Event between 98WW31 and star GA1100:00928233 with event index number of 1141776

Geocentric closest approach at 2021/10/09 06:39:27 UTC

J2000 position of star is 05:10:40.9 +20:33:11
Equinox of date position of star is 05:11:52.2 +20:34:36
Stellar brightness G=13.8, use SENSEUP=64
Star is 156 degrees from the moon. Moon is 11% illuminated.
TNO apparent brightness V=23.1

[RECON map]
TNO is 47.9 AU from the Sun and 47.4 AU from the Earth.
The TNO is moving 10.2 km/sec on the sky relative to the star, or, 1.1 arcsec/hr.
The 1-sigma error in the time of the event is 1740 seconds.
The 1-sigma cross-track error in the shadow position is 3490 km.
The sky-plane scale is 34365.7 km/arcsec.

The TNO has an absolute magnitude Hv=6.2
Diameter=353.2 km assuming a 5% albedo -- 34.6 sec chord
Diameter=144.2 km assuming a 30% albedo -- 14.1 sec chord
Dynamical classification is CLASSICAL
 
 
 
 
 
 

Star training set for 98WW31, (2021/10/09 06:39UT)
Object            RA         Dec     mag  sep  mel
Aldebaran      04:37:10.3 +16:33:05  0.8  9.18 164
Alnath         05:27:40.2 +28:37:26  1.6  8.80 151
102Iot Tau     05:04:24.0 +21:37:09  4.6  2.05 158
PPM 094144     05:12:05.2 +20:35:40  8.2  0.03 156
98WW31         05:11:58.5 +20:34:43 13.8       156
Positions are for equinox of date

This table contains the target star visibility for the RECON network. The observing range has been set to a maximum of 0.5 sigma about the mid-time.
The median site spacing is 16.8 km RECON observability=1.0 and success probability=8.5%
Site Site mid-time
(UT)
Sun alt
(deg)
Sky Moon Star alt
(deg)
Star az
(deg)
Target Observing Time
(UT)
X-track
(km)
Victoria 06:44:26 -44.8 Dark Down 20.5 81.8 Low 06:29:26 - 06:59:26 -2799
Clarence Fulton 06:44:07 -44.3 Dark Down 23.3 85.5 Low 06:29:07 - 06:59:07 -2820
Kelowna 06:44:13 -44.7 Dark Down 23.2 85.2 Low 06:29:13 - 06:59:13 -2836
Summerland 06:44:14 -44.9 Dark Down 23.1 84.9 Low 06:29:14 - 06:59:14 -2844
Penticton 06:44:16 -45.0 Dark Down 23.1 85.0 Low 06:29:16 - 06:59:16 -2851
Oliver 06:44:19 -45.3 Dark Down 23.1 84.8 Low 06:29:19 - 06:59:19 -2870
Anarchist Mountain Observatory 06:44:19 -45.5 Dark Down 23.2 84.9 Low 06:29:19 - 06:59:19 -2884
Tonasket 06:44:22 -45.8 Dark Down 23.2 84.7 Low 06:29:22 - 06:59:22 -2899
Okanogan 06:44:25 -46.0 Dark Down 23.0 84.5 Low 06:29:25 - 06:59:25 -2914
Brewster 06:44:28 -46.2 Dark Down 22.9 84.2 Low 06:29:28 - 06:59:28 -2923
Manson/Chelan 06:44:32 -46.3 Dark Down 22.6 83.9 Low 06:29:32 - 06:59:32 -2924
Entiat 06:44:31 -46.5 Dark Down 22.6 83.8 Low 06:29:31 - 06:59:31 -2934
Wenatchee 06:44:36 -46.7 Dark Down 22.5 83.6 Low 06:29:36 - 06:59:36 -2946
Ellensburg 06:44:39 -47.1 Dark Down 22.3 83.3 Low 06:29:39 - 06:59:39 -2962
Yakima 06:44:43 -47.4 Dark Down 22.2 83.1 Low 06:29:43 - 06:59:43 -2985
Toppenish/White Swan 06:44:45 -47.7 Dark Down 22.3 83.2 Low 06:29:45 - 06:59:45 -3003
Goldendale 06:44:50 -48.1 Dark Down 22.0 82.7 Low 06:29:50 - 06:59:50 -3022
The Dalles 06:44:53 -48.2 Dark Down 21.7 82.3 Low 06:29:53 - 06:59:53 -3025
Pasco 06:44:45 -48.1 Dark Down 23.2 84.0 Low 06:29:45 - 06:59:45 -3047
Maupin 06:44:56 -48.6 Dark Down 21.7 82.2 Low 06:29:56 - 06:59:56 -3052
PNWRO 06:44:48 -48.4 Dark Down 23.3 84.0 Low 06:29:48 - 06:59:48 -3068
Sisters 06:45:03 -49.2 Dark Down 21.3 81.6 Low 06:30:03 - 07:00:03 -3090
Redmond 06:45:06 -49.4 Dark Down 21.6 81.9 Low 06:30:06 - 07:00:06 -3103
Bend 06:45:07 -49.5 Dark Down 21.4 81.7 Low 06:30:07 - 07:00:07 -3112
Oregon Observatory 06:45:10 -49.6 Dark Down 21.3 81.5 Low 06:30:10 - 07:00:10 -3118
La Pine/Gilchrist 06:45:11 -49.8 Dark Down 21.3 81.4 Low 06:30:11 - 07:00:11 -3129
North Lake 06:45:13 -50.4 Dark Down 21.6 81.6 Low 06:30:13 - 07:00:13 -3174
Klamath Falls 06:45:23 -51.0 Dark Down 20.9 80.7 Low 06:30:23 - 07:00:23 -3211
Paisley 06:45:19 -51.0 Dark Down 21.8 81.7 Low 06:30:19 - 07:00:19 -3220
Lakeview 06:45:22 -51.5 Dark Down 21.9 81.6 Low 06:30:22 - 07:00:22 -3258
Fall River/Burney 06:45:31 -52.2 Dark Down 21.0 80.5 Low 06:30:31 - 07:00:31 -3299
Cedarville 06:45:28 -52.2 Dark Down 22.0 81.5 Low 06:30:28 - 07:00:28 -3306
Susanville 06:45:37 -53.0 Dark Down 21.5 80.8 Low 06:30:37 - 07:00:37 -3364
Greenville 06:45:41 -53.2 Dark Down 21.2 80.5 Low 06:30:41 - 07:00:41 -3372
Gimple 06:45:41 -53.2 Dark Down 21.3 80.5 Low 06:30:41 - 07:00:41 -3375
Quincy 06:45:42 -53.4 Dark Down 21.2 80.4 Low 06:30:42 - 07:00:42 -3386
Portola 06:45:43 -53.7 Dark Down 21.5 80.6 Low 06:30:43 - 07:00:43 -3410
Reno 06:45:43 -54.1 Dark Down 22.0 80.9 Low 06:30:43 - 07:00:43 -3449
Carson City 06:45:48 -54.5 Dark Down 22.0 80.8 Low 06:30:48 - 07:00:48 -3474
Gardnerville 06:45:49 -54.7 Dark Down 22.0 80.7 Low 06:30:49 - 07:00:49 -3492
Yerington 06:45:48 -54.8 Dark Down 22.4 81.1 Low 06:30:48 - 07:00:48 -3509
Hawthorne 06:45:51 -55.4 Dark Down 22.8 81.2 Low 06:30:51 - 07:00:51 -3559
Lee Vining 06:45:56 -55.8 Dark Down 22.3 80.7 Low 06:30:56 - 07:00:56 -3581
Tonopah 06:45:53 -56.3 Dark Down 23.8 81.8 Low 06:30:53 - 07:00:53 -3639
Bishop 06:45:59 -56.6 Dark Down 22.8 80.9 Low 06:30:59 - 07:00:59 -3649
CPSLO 06:46:20 -57.6 Dark Down 20.7 78.9 Low 06:31:20 - 07:01:20 -3721
Beatty 06:46:01 -57.5 Dark Down 24.0 81.6 Low 06:31:01 - 07:01:01 -3738
Indian Springs 06:46:03 -58.2 Dark Down 24.8 82.0 Low 06:31:03 - 07:01:03 -3800
Henderson 06:46:05 -58.9 Dark Down 25.3 82.2 Low 06:31:05 - 07:01:05 -3864
Wildwood 06:46:26 -59.5 Dark Down 22.2 79.5 Low 06:31:26 - 07:01:26 -3882
Niwot 06:45:08 -56.3 Dark Down 33.1 90.1 Up 06:30:08 - 07:00:08 -3904
SwRI 06:45:11 -56.4 Dark Down 33.1 90.0 Up 06:30:11 - 07:00:11 -3908
Searchlight/Boulder City 06:46:10 -59.4 Dark Down 25.3 82.0 Low 06:31:10 - 07:01:10 -3909
Laughlin/Bullhead City 06:46:12 -59.8 Dark Down 25.6 82.0 Low 06:31:12 - 07:01:12 -3944
Patrick 06:46:10 -59.8 Dark Down 26.2 82.5 Low 06:31:10 - 07:01:10 -3951
Kingman/Dolan Springs 06:46:11 -59.9 Dark Down 26.0 82.3 Low 06:31:11 - 07:01:11 -3961
Mohave Valley 06:46:14 -60.1 Dark Down 25.5 81.9 Low 06:31:14 - 07:01:14 -3965
Idyllwild 06:46:27 -60.5 Dark Down 23.6 80.3 Low 06:31:27 - 07:01:27 -3976
DCO 06:46:10 -60.2 Dark Down 26.7 82.7 Low 06:31:10 - 07:01:10 -3999
Lake Havasu City 06:46:15 -60.5 Dark Down 25.7 81.8 Low 06:31:15 - 07:01:15 -4005
Parker 06:46:18 -60.9 Dark Down 25.7 81.7 Low 06:31:18 - 07:01:18 -4033
Blythe 06:46:24 -61.3 Dark Down 25.4 81.3 Low 06:31:24 - 07:01:24 -4063
Calipatria 06:46:27 -61.5 Dark Down 24.5 80.6 Low 06:31:27 - 07:01:27 -4067
Yuma 06:46:31 -62.1 Dark Down 25.2 80.9 Low 06:31:31 - 07:01:31 -4134
George/Scottsdale 06:46:17 -61.9 Dark Down 27.6 82.7 Low 06:31:17 - 07:01:17 -4155

Azimuth is measured in degrees eastward from north. North is at an azimuth of 0, due East is at an azimuth of 90 degrees, due South is 180, and due West is 270.

Do not use the listing below for the RECON CPC 1100 telescopes. This is provided for other non-team facilities.

Star training set for 98WW31, (2021/10/09 06:39UT)
Object            RA         Dec     mag  sep  mel
Aldebaran      04:35:55.3 +16:30:30  0.8  9.18 164
Alnath         05:26:17.5 +28:36:23  1.6  8.80 151
102Iot Tau     05:03:05.8 +21:35:23  4.6  2.05 158
PPM 094144     05:10:47.6 +20:34:09  8.2  0.03 156
98WW31         05:10:40.9 +20:33:11 13.8       156
Positions are for J2000

Event circumstances last updated at 2020/01/02 23:07:25 UT

Marc W. Buie, Southwest Research Institute

RECON